LUX #10 1/2 Window Envelopes (4 1/2 x 9 1/2) are perfect for mailing checks, invoices, letterhead, personal letters, statements, and direct mail.When sending letters, invoices or statements, save the time and expense of separately addressing envelopes. Simply position the address to show through the window, or choose our full-face windows, which are large enough to show off the entire contents. Available in a variety of styles and colors, printed or plain.

When sending letters, invoices or statements, save the time and expense of separately addressing envelopes. Simply position the address to show through the window, or choose our full-face windows, which are large enough to show off the entire contents. Available in a variety of styles and colors, printed or plain.